What is the difference between a PUSH and a POP in Stack Data Structure?

What distinguishes a dynamic stack from one that is static?

Can you name any possible object types for usage in an STL stack? What kind of data structure does the standard template library (STL) stack use?

Draw the stack memory diagram for a function value parameter (see code below):someheader.hint echo_number(int num);somecpp.cppint echo_number(int num){  return num;}main.cppint main(){   auto num = 5;   auto echo = echo_number(num);  return 0;}